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NFS: Fix a COMMIT race in pNFS

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We must make sure that cinfo->ds->nwritten is in sync with the
commit list, since it is checked as part of pnfs_scan_commit_lists().

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2017-07-12 19:10:56 -04:00 committed by Anna Schumaker
parent 89a6814d9b
commit e39928f942
1 changed files with 7 additions and 3 deletions
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10
fs/nfs/pnfs_nfs.c
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@ -159,13 +159,18 @@ void pnfs_generic_recover_commit_reqs(struct list_head *dst,
{
struct pnfs_commit_bucket *b;
struct pnfs_layout_segment *freeme;
int nwritten;
int i;
lockdep_assert_held(&cinfo->inode->i_lock);
restart:
for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
if (pnfs_generic_transfer_commit_list(&b->written, dst,
cinfo, 0)) {
nwritten = pnfs_generic_transfer_commit_list(&b->written,
dst, cinfo, 0);
if (!nwritten)
continue;
cinfo->ds->nwritten -= nwritten;
if (list_empty(&b->written)) {
freeme = b->wlseg;
b->wlseg = NULL;
spin_unlock(&cinfo->inode->i_lock);
@ -174,7 +179,6 @@ restart:
goto restart;
}
}
cinfo->ds->nwritten = 0;
}
EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);